Discuss long-distance migration of sockeye salmon and ruby-throated hummingbirds with respect to stimulus for migration, metabolic preparation, feeding during migration, and metabolism during migration
What will be an ideal response?
Answer: Sockeye salmon grow and mature in the ocean and their migration to freshwater streams/rivers, where they were born, is seasonal and stimulated by reproductive maturity. To prepare for migration, the salmon fatten up and store most of the energy needed for migration as lipid or fat. Salmon do not feed during migration; they rely totally on their energy reserves. The advantage of not feeding on route means salmon do not need to utilize any time searching for food and avoid the risk of predation while feeding.
Ruby-throated hummingbird's migration south to wintering grounds is stimulated by photoperiod. Hummingbirds, like many migrating animals, store fat for migration because fat has a high energetic density. Unlike sockeye salmon, hummingbirds require more energy for migration than they can store, and as a result, they need to feed along their migration route.
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